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(No Model.)

J. A. ARMBRUSTER. GRADEB AND IAMALGAMATOR..

No. 517,721I

Patented Apr In V ATTORNEYS.

mi NlmuNAL umoaMPNma COMPANY.

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UNITED STA-TitsV PATENT OFFICE. y

.IOHN A. ARMBRUSTER, OF CHICAGO, ILLINOIS.

lGRADER AN D AMALGAIVIATO R.

SPECIFICATIONv forming part of Letters Patent No. 517,721, dated April 3, 1894."

Application filed .my 12,1893.

To all whom it may concern;

Be it known that I, JOHN A. ,ARMBRUsTna of Chicago, in the county of Cook and State of Illinois, have invented a new and Improved Grader and Amalgamator, of which thefollowing is a full,`clear, and exact description.

downwardly vfrom the inlet to their individual.

outlets and the lowermost sieves inclined upwardly to their' outlets.

The invention also consists of certain parts and details, and combinations of the same, as

will be hereinafter described and then pointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar letters of reference indicate corresponding parts in both the figures.

Figurerl is a sectional side elevation of the improvement; and Fig. 2 is a sectional plan view of one of the sieves. Y

The improved separator is provided with a suitably constructed box A connected 'at its top plate A with the suspending rods B having a ball and socket joint at their upper ends to connect with a ceiling C or other suitable support.

The bottom A2 of the box A is connected with a suitable mechanism D for imparting a gyrating motion to the said box, the latter f swinging on the supporting rods B.

On one end of the box A at the top plate A is arranged a iiexible inlet E connected' with G2,A GB and G4, extending kfrom the end A3 of'` the boxA to within a suitable distance of the other end A4 to discharge at this end into individual outlets H,H, H2, Ha and H4, respect ively, arranged vertically and connected at Serial No. 480,203- (No model.)

G2 and G4 are inclined upwardly from the endY A2 to their respective outlets H3 and H4. The lowermost screen G4 is a 'suitable distance above the bottom A2 so as to form within theY casing a receiving chamber A5 provided with a 'water outlet A6 for carrying off surplus water.

The top surface of the bottom A2 is formed with recesses or grooves containing mercury so as to readilytake up the gold passing down The operation is as follows: The box A re-I l oeives the usual gyrating motion and when the stock is discharged into the box at the inlet E, then the stock iirst encounters the up per end of the top, the sieve Gwhichhas the greatest mesh, and discharges onto the second sieve G of asomewhat finer mesh, it being un derstood that the large tailings passing onto the sieve G roll down the same yinto the outlet H to be discharged to the outside by the chute I. The second great tailings are discharged by the sieveG at its lower end into the outlet H while the material which passes through the meshes of the sieve G falls onto the third sieve G2 having a finer mesh than the sieve G. The material passing through this sieve G2 falls onto the next sieve G3 which is inclined in an opposite direction to the sieves G2, G and G, so that the material re mainsa longer time on the sieve to completely separate the tailings from the valuable stock, the tailings passing up the sieve to be nally discharged at its upper end into the outlet H2. The material will first accumulate at the lower end of the sieve, and as a grating effect is produced on the material by the gyratory motion of the machine, the heavier particles will work to the bottom, and the lighter ones to the top. As the lighter material gradually accumulates at the top and cannot travel in any other direction than toward the outlet located at the upper end of the sieve, said lighter particles will move upward to the said outlet llbeing backed up partly by the head A3 which forms anV abutment for thesaid particles, and partly by the projections G5. The liner stock next passes onto the lowerinost sieve GrL on which it is likewise treated, the tailings being discharged at the upper end of the sieve into the outlet H4. The valuable stock passes through the fine meshes of the sieve GrL into the chamber A5 in which the gold is readily taken up by the mercury contained in the pockets formed by the recesses and grooves A7, and the amalgamated material is, from time to time, removed for further treatment. lt is understood that the stock passes into the box A with a considerable quantity of water part of which passes with the tailings through the outlets H, H', H2, I-1 and I-I4 to the outside and part passes through the outlet A6 leading from the chamber A5.

Having thus fully described my invention, I claim as new and desire to secure by Letters Patent- 1. A grader or like machine, comprising a box, provided with a suitable inlet, means for imparting a gyratory motion to the said box, and a series of superposed graduated sieves located in the box, the upper sieves being inclined downwardly toward their delivery ends so that the coarser particles will be accelerated in their motion toward the delivery ends of the said sieves, the lower sieves being fed by the upper ones, and inclined upwardly toward their delivery ends, to retard the finer particles and thus maintain a-supply to the lower sieves equal to their full capacity, substantially as described.

2. A grader and amalgamator comprising a gyratin g box connected at its top near one end with a stock supply, a series ot' graduated sieves arranged one above the other within the said box, the uppermost sieves being inclined in an opposite direction to the lowermost sieves, outlets arranged within the said box at the discharge ends of the said sieves, and a receiving chamber formed within the box below the lowermost sieve and provided in its bottom with pockets adapted to receive mercury, substantially as shown and described.

3. A grader and amalgamator comprising a gyrating box connected at its top near one end with a stock supply, a series of graduated sieves arranged one above the other within the said box, the uppermost sieves being inclined in an opposite direction to the lowermost sieves, outlets arranged Within the said box at the discharge ends of the said sieves, a receiving chamber formed within the box below the lowermost sieve and provided in its bottom with pockets adapted to receive mercury, and a water outlet leading from the said chamber, substantial] y as shown and described.

JOHN A. ARMBRUSTER. Vitnesses:

CHARLES A. ARMBRUSTER, AUGUST J. BAUMANN. 

